Automatic radio frequency feedback calibration circuit
US7495518B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 2007 |
| Grant date | Feb 24, 2009 |
| Priority date | — |
| Expiry date | Aug 19, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A calibration circuit is configured to provide automatic feedback calibration during a tuning cycle. Automating the calibration process reduces the engineering evaluation time and mass production test time. The calibration settings vary as a function of frequency, and the calibration circuit automatically determines the proper calibration for any frequency application. The calibration circuit enhances communication performance by comparing and computing a time difference between a reference path and a feedback path. The calibration circuit is configured as part of a phase modulation path within a modulation circuit. The calibration circuit provides for calibration without prior knowledge of the system and reduced factory test time. The calibration circuit provides numerous advantages, including, but not limited to, accurate system results for time, frequency, temperature, and process variations with each calibration, or tuning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.